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Heyman C. Duecker and Harry C. Helmlinger Jr received US Patent No. 3,625,887 on December 7, 1971, filed March 15, 1968.
The patent's abstract:
A fine-sized noncaking urea is prepared by feeding urea into a fluid energy mill under low moisture conditions.
- Author
- Heyman C. Duecker; Harry C. Helmlinger Jr
- Published by
- US Patent Office
- Series
- US Patent No. 3,625,887
- Date
- December 7, 1971
- Library no.
- ACL Doc 23238 · asbestosclaims.law/library/23238
- Rights
- US government work, in the public domain.
Read or download
Read online Download the PDF PDF · 5 pages · 275 KB
Where it was listed
- Asbestos, May 1972, in its patents department (the year's issues)
Cite this document
Heyman C. Duecker, Harry C. Helmlinger Jr. “Noncaking urea composition containing asbestos, alumina or silica having an ultimate particle size of 2{14 20 microns and the method of preparation (US Patent 3,625,887, 1971).” December 7, 1971. US Patent No. 3,625,887. US Patent Office. AsbestosClaims.Law Library, ACL Doc 23238. https://asbestosclaims.law/library/23238.
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